GNSS augmentation

About: GNSS augmentation is a research topic. Over the lifetime, 2478 publications have been published within this topic receiving 28513 citations. The topic is also known as: SBAS & Satellite Based Augmentation System.

Systems and methods for reducing error detection latency in lpv approaches

Abstract: Systems and methods for reducing error detection latency in LPV approaches are provided. In certain embodiments, a method for navigational guidance includes calibrating inertial measurements acquired from an inertial navigation system with satellite-based augmentation system position measurements acquired from a satellite-based augmentation system to create corrected inertial navigation system positions. The method also includes determining whether the satellite-based augmentation system experienced a fault when the inertial measurements were calibrated with the satellite-based augmentation system position measurements. Further, when the satellite-based augmentation system did not experience a fault, the method includes monitoring the satellite-based augmentation system navigation position measurements based on the corrected inertial navigation system positions.

A new scheme of vision based navigation for flying vehicles-concept study and experiment evaluation

Abstract: In this paper, a new scheme of vision based navigation was proposed for flying vehicles. In this navigation scheme, the main navigation tool is a camera, plus an altimeter. The feasibility of this navigation scheme was carefully studied both from theory and numerical analysis. Unlike most of vision based navigation approaches using feature trajectories to compute 3D-platform motion, we use the image geometrical transformation parameters between consecutive frames to infer3D displacement of camera. Due to this change, the navigation process can be conducted even if there is no salient features that can be extracted from in the image sequence, for example, in the case of flying over the sea. As a result, the long-range navigation becomes possible by use EO sensor. Moreover, the way of improvement navigation accuracy was also discussed in the paper. The experiment results demonstrated that the navigation accuracy of this system is compatible to GPS (Global Positioning system), much higher than all kinds of INS (Inertial Navigation System) in terms of position estimation. It is a good alternative choice when the GPS signal is not available.

LDACS1 for APNT — Planning and realization of a flight measurement campaign

Abstract: Recently, it has been proposed to extend the functionality of the future L-band Digital Aeronautical Communication System type 1 (LDACS1) to allow for navigational services. Specifically, the LDACS1 system can be modified to provide an Alternative Positioning, Navigation, and Timing (APNT) service for aeronautics during possible GNSS (Global Navigation Satellite System) outages. In this paper, we outline the main steps behind the measurement campaign aimed at validating and testing in realistic scenarios the LDACS1 proposal for navigation. We describe the measurement setup, synchronization of stations, and calibration of the measurement equipment.

Indoor altitude measurement by GNSS receiver

Abstract: Global Navigation Satellite Systems (GNSS), such as the US GPS, the European GALILEO and the Russian GLONASS are very limited indoors, due to very low power levels and significant multipath. So, though hundreds of millions of people around the world use GPS receivers, particularly embedded in mobile devices, they cannot use these devices indoors, where they stay most of the time. Present art methods for augmenting or assisting GPS indoors, are mainly based on cellular or WLAN networks, and embedded sensors such as accelerometers and compasses, yet no integrated solution was launched. The present invention discloses a method that may contribute to GNSS indoors navigation, enabling a GNSS receiver to measure its elevation above sea level, indoors, to a floor resolution. The disclosed method is based on terrestrial infrastructure, yet possibly only one beacon per building.

System and methods for reducing gnss receiver power usage by leveraging signals of opportunity to predict gnss availability

Abstract: A system and methods for reducing navigation satellite receiver power usage are presented. A wireless signal is received at a portable electronic device in a signal environment. At signal characteristic of the wireless signal at the portable electronic device is measured in the signal environment. An estimated signal strength of the wireless signal in the signal environment is estimated based on the signal characteristic. The estimated signal strength is compared to an expected signal strength of the wireless signal to calculate an estimated signal-strength-change relative to the expected signal strength. A GNSS signal is tracked at the portable electronic device, if the estimated signal-strength-change indicates an expected GNSS signal attenuation is lower than a signal attenuation threshold. The tracking of the GNSS signal is reconfigured at the portable electronic device, if the expected GNSS signal-strength-change indicates the expected GNSS signal attenuation is greater than the signal attenuation threshold.